in6.c revision f28e25322562395b296ee23a4a14deea4c73e630
1/*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	$KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
30 */
31
32/*-
33 * Copyright (c) 1982, 1986, 1991, 1993
34 *	The Regents of the University of California.  All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 *    notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 *    notice, this list of conditions and the following disclaimer in the
43 *    documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 *    may be used to endorse or promote products derived from this software
46 *    without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 *	@(#)in.c	8.2 (Berkeley) 11/15/93
61 */
62
63#include <sys/cdefs.h>
64__FBSDID("$FreeBSD$");
65
66#include "opt_compat.h"
67#include "opt_inet.h"
68#include "opt_inet6.h"
69
70#include <sys/param.h>
71#include <sys/eventhandler.h>
72#include <sys/errno.h>
73#include <sys/jail.h>
74#include <sys/malloc.h>
75#include <sys/socket.h>
76#include <sys/socketvar.h>
77#include <sys/sockio.h>
78#include <sys/systm.h>
79#include <sys/priv.h>
80#include <sys/proc.h>
81#include <sys/time.h>
82#include <sys/kernel.h>
83#include <sys/syslog.h>
84
85#include <net/if.h>
86#include <net/if_var.h>
87#include <net/if_types.h>
88#include <net/route.h>
89#include <net/if_dl.h>
90#include <net/vnet.h>
91
92#include <netinet/in.h>
93#include <netinet/in_var.h>
94#include <net/if_llatbl.h>
95#include <netinet/if_ether.h>
96#include <netinet/in_systm.h>
97#include <netinet/ip.h>
98#include <netinet/in_pcb.h>
99#include <netinet/ip_carp.h>
100
101#include <netinet/ip6.h>
102#include <netinet6/ip6_var.h>
103#include <netinet6/nd6.h>
104#include <netinet6/mld6_var.h>
105#include <netinet6/ip6_mroute.h>
106#include <netinet6/in6_ifattach.h>
107#include <netinet6/scope6_var.h>
108#include <netinet6/in6_pcb.h>
109
110VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix);
111#define V_icmp6_nodeinfo_oldmcprefix	VNET(icmp6_nodeinfo_oldmcprefix)
112
113/*
114 * Definitions of some costant IP6 addresses.
115 */
116const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
117const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
118const struct in6_addr in6addr_nodelocal_allnodes =
119	IN6ADDR_NODELOCAL_ALLNODES_INIT;
120const struct in6_addr in6addr_linklocal_allnodes =
121	IN6ADDR_LINKLOCAL_ALLNODES_INIT;
122const struct in6_addr in6addr_linklocal_allrouters =
123	IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
124const struct in6_addr in6addr_linklocal_allv2routers =
125	IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
126
127const struct in6_addr in6mask0 = IN6MASK0;
128const struct in6_addr in6mask32 = IN6MASK32;
129const struct in6_addr in6mask64 = IN6MASK64;
130const struct in6_addr in6mask96 = IN6MASK96;
131const struct in6_addr in6mask128 = IN6MASK128;
132
133const struct sockaddr_in6 sa6_any =
134	{ sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
135
136static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *,
137	struct in6_aliasreq *, int);
138static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
139
140static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *,
141    struct in6_ifaddr *, int);
142static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *,
143    struct in6_aliasreq *, int flags);
144static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *,
145    struct in6_ifaddr *, int, int);
146static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *,
147    struct in6_ifaddr *, int);
148
149#define ifa2ia6(ifa)	((struct in6_ifaddr *)(ifa))
150#define ia62ifa(ia6)	(&((ia6)->ia_ifa))
151
152
153void
154in6_newaddrmsg(struct in6_ifaddr *ia, int cmd)
155{
156	struct sockaddr_dl gateway;
157	struct sockaddr_in6 mask, addr;
158	struct rtentry rt;
159
160	/*
161	 * initialize for rtmsg generation
162	 */
163	bzero(&gateway, sizeof(gateway));
164	gateway.sdl_len = sizeof(gateway);
165	gateway.sdl_family = AF_LINK;
166
167	bzero(&rt, sizeof(rt));
168	rt.rt_gateway = (struct sockaddr *)&gateway;
169	memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
170	memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
171	rt_mask(&rt) = (struct sockaddr *)&mask;
172	rt_key(&rt) = (struct sockaddr *)&addr;
173	rt.rt_flags = RTF_HOST | RTF_STATIC;
174	if (cmd == RTM_ADD)
175		rt.rt_flags |= RTF_UP;
176	/* Announce arrival of local address to all FIBs. */
177	rt_newaddrmsg(cmd, &ia->ia_ifa, 0, &rt);
178}
179
180int
181in6_mask2len(struct in6_addr *mask, u_char *lim0)
182{
183	int x = 0, y;
184	u_char *lim = lim0, *p;
185
186	/* ignore the scope_id part */
187	if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
188		lim = (u_char *)mask + sizeof(*mask);
189	for (p = (u_char *)mask; p < lim; x++, p++) {
190		if (*p != 0xff)
191			break;
192	}
193	y = 0;
194	if (p < lim) {
195		for (y = 0; y < 8; y++) {
196			if ((*p & (0x80 >> y)) == 0)
197				break;
198		}
199	}
200
201	/*
202	 * when the limit pointer is given, do a stricter check on the
203	 * remaining bits.
204	 */
205	if (p < lim) {
206		if (y != 0 && (*p & (0x00ff >> y)) != 0)
207			return (-1);
208		for (p = p + 1; p < lim; p++)
209			if (*p != 0)
210				return (-1);
211	}
212
213	return x * 8 + y;
214}
215
216#ifdef COMPAT_FREEBSD32
217struct in6_ndifreq32 {
218	char ifname[IFNAMSIZ];
219	uint32_t ifindex;
220};
221#define	SIOCGDEFIFACE32_IN6	_IOWR('i', 86, struct in6_ndifreq32)
222#endif
223
224int
225in6_control(struct socket *so, u_long cmd, caddr_t data,
226    struct ifnet *ifp, struct thread *td)
227{
228	struct	in6_ifreq *ifr = (struct in6_ifreq *)data;
229	struct	in6_ifaddr *ia = NULL;
230	struct	in6_aliasreq *ifra = (struct in6_aliasreq *)data;
231	struct sockaddr_in6 *sa6;
232	int carp_attached = 0;
233	int error;
234	u_long ocmd = cmd;
235
236	/*
237	 * Compat to make pre-10.x ifconfig(8) operable.
238	 */
239	if (cmd == OSIOCAIFADDR_IN6)
240		cmd = SIOCAIFADDR_IN6;
241
242	switch (cmd) {
243	case SIOCGETSGCNT_IN6:
244	case SIOCGETMIFCNT_IN6:
245		/*
246		 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
247		 * We cannot see how that would be needed, so do not adjust the
248		 * KPI blindly; more likely should clean up the IPv4 variant.
249		 */
250		return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
251	}
252
253	switch (cmd) {
254	case SIOCAADDRCTL_POLICY:
255	case SIOCDADDRCTL_POLICY:
256		if (td != NULL) {
257			error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
258			if (error)
259				return (error);
260		}
261		return (in6_src_ioctl(cmd, data));
262	}
263
264	if (ifp == NULL)
265		return (EOPNOTSUPP);
266
267	switch (cmd) {
268	case SIOCSNDFLUSH_IN6:
269	case SIOCSPFXFLUSH_IN6:
270	case SIOCSRTRFLUSH_IN6:
271	case SIOCSDEFIFACE_IN6:
272	case SIOCSIFINFO_FLAGS:
273	case SIOCSIFINFO_IN6:
274		if (td != NULL) {
275			error = priv_check(td, PRIV_NETINET_ND6);
276			if (error)
277				return (error);
278		}
279		/* FALLTHROUGH */
280	case OSIOCGIFINFO_IN6:
281	case SIOCGIFINFO_IN6:
282	case SIOCGDRLST_IN6:
283	case SIOCGPRLST_IN6:
284	case SIOCGNBRINFO_IN6:
285	case SIOCGDEFIFACE_IN6:
286		return (nd6_ioctl(cmd, data, ifp));
287
288#ifdef COMPAT_FREEBSD32
289	case SIOCGDEFIFACE32_IN6:
290		{
291			struct in6_ndifreq ndif;
292			struct in6_ndifreq32 *ndif32;
293
294			error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
295			    ifp);
296			if (error)
297				return (error);
298			ndif32 = (struct in6_ndifreq32 *)data;
299			ndif32->ifindex = ndif.ifindex;
300			return (0);
301		}
302#endif
303	}
304
305	switch (cmd) {
306	case SIOCSIFPREFIX_IN6:
307	case SIOCDIFPREFIX_IN6:
308	case SIOCAIFPREFIX_IN6:
309	case SIOCCIFPREFIX_IN6:
310	case SIOCSGIFPREFIX_IN6:
311	case SIOCGIFPREFIX_IN6:
312		log(LOG_NOTICE,
313		    "prefix ioctls are now invalidated. "
314		    "please use ifconfig.\n");
315		return (EOPNOTSUPP);
316	}
317
318	switch (cmd) {
319	case SIOCSSCOPE6:
320		if (td != NULL) {
321			error = priv_check(td, PRIV_NETINET_SCOPE6);
322			if (error)
323				return (error);
324		}
325		/* FALLTHROUGH */
326	case SIOCGSCOPE6:
327	case SIOCGSCOPE6DEF:
328		return (scope6_ioctl(cmd, data, ifp));
329	}
330
331	/*
332	 * Find address for this interface, if it exists.
333	 *
334	 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
335	 * only, and used the first interface address as the target of other
336	 * operations (without checking ifra_addr).  This was because netinet
337	 * code/API assumed at most 1 interface address per interface.
338	 * Since IPv6 allows a node to assign multiple addresses
339	 * on a single interface, we almost always look and check the
340	 * presence of ifra_addr, and reject invalid ones here.
341	 * It also decreases duplicated code among SIOC*_IN6 operations.
342	 */
343	switch (cmd) {
344	case SIOCAIFADDR_IN6:
345	case SIOCSIFPHYADDR_IN6:
346		sa6 = &ifra->ifra_addr;
347		break;
348	case SIOCSIFADDR_IN6:
349	case SIOCGIFADDR_IN6:
350	case SIOCSIFDSTADDR_IN6:
351	case SIOCSIFNETMASK_IN6:
352	case SIOCGIFDSTADDR_IN6:
353	case SIOCGIFNETMASK_IN6:
354	case SIOCDIFADDR_IN6:
355	case SIOCGIFPSRCADDR_IN6:
356	case SIOCGIFPDSTADDR_IN6:
357	case SIOCGIFAFLAG_IN6:
358	case SIOCSNDFLUSH_IN6:
359	case SIOCSPFXFLUSH_IN6:
360	case SIOCSRTRFLUSH_IN6:
361	case SIOCGIFALIFETIME_IN6:
362	case SIOCSIFALIFETIME_IN6:
363	case SIOCGIFSTAT_IN6:
364	case SIOCGIFSTAT_ICMP6:
365		sa6 = &ifr->ifr_addr;
366		break;
367	case SIOCSIFADDR:
368	case SIOCSIFBRDADDR:
369	case SIOCSIFDSTADDR:
370	case SIOCSIFNETMASK:
371		/*
372		 * Although we should pass any non-INET6 ioctl requests
373		 * down to driver, we filter some legacy INET requests.
374		 * Drivers trust SIOCSIFADDR et al to come from an already
375		 * privileged layer, and do not perform any credentials
376		 * checks or input validation.
377		 */
378		return (EINVAL);
379	default:
380		sa6 = NULL;
381		break;
382	}
383	if (sa6 && sa6->sin6_family == AF_INET6) {
384		if (sa6->sin6_scope_id != 0)
385			error = sa6_embedscope(sa6, 0);
386		else
387			error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
388		if (error != 0)
389			return (error);
390		if (td != NULL && (error = prison_check_ip6(td->td_ucred,
391		    &sa6->sin6_addr)) != 0)
392			return (error);
393		ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
394	} else
395		ia = NULL;
396
397	switch (cmd) {
398	case SIOCSIFADDR_IN6:
399	case SIOCSIFDSTADDR_IN6:
400	case SIOCSIFNETMASK_IN6:
401		/*
402		 * Since IPv6 allows a node to assign multiple addresses
403		 * on a single interface, SIOCSIFxxx ioctls are deprecated.
404		 */
405		/* we decided to obsolete this command (20000704) */
406		error = EINVAL;
407		goto out;
408
409	case SIOCDIFADDR_IN6:
410		/*
411		 * for IPv4, we look for existing in_ifaddr here to allow
412		 * "ifconfig if0 delete" to remove the first IPv4 address on
413		 * the interface.  For IPv6, as the spec allows multiple
414		 * interface address from the day one, we consider "remove the
415		 * first one" semantics to be not preferable.
416		 */
417		if (ia == NULL) {
418			error = EADDRNOTAVAIL;
419			goto out;
420		}
421		/* FALLTHROUGH */
422	case SIOCAIFADDR_IN6:
423		/*
424		 * We always require users to specify a valid IPv6 address for
425		 * the corresponding operation.
426		 */
427		if (ifra->ifra_addr.sin6_family != AF_INET6 ||
428		    ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
429			error = EAFNOSUPPORT;
430			goto out;
431		}
432
433		if (td != NULL) {
434			error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
435			    PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
436			if (error)
437				goto out;
438		}
439		/* FALLTHROUGH */
440	case SIOCGIFSTAT_IN6:
441	case SIOCGIFSTAT_ICMP6:
442		if (ifp->if_afdata[AF_INET6] == NULL) {
443			error = EPFNOSUPPORT;
444			goto out;
445		}
446		break;
447
448	case SIOCGIFADDR_IN6:
449		/* This interface is basically deprecated. use SIOCGIFCONF. */
450		/* FALLTHROUGH */
451	case SIOCGIFAFLAG_IN6:
452	case SIOCGIFNETMASK_IN6:
453	case SIOCGIFDSTADDR_IN6:
454	case SIOCGIFALIFETIME_IN6:
455		/* must think again about its semantics */
456		if (ia == NULL) {
457			error = EADDRNOTAVAIL;
458			goto out;
459		}
460		break;
461
462	case SIOCSIFALIFETIME_IN6:
463	    {
464		struct in6_addrlifetime *lt;
465
466		if (td != NULL) {
467			error = priv_check(td, PRIV_NETINET_ALIFETIME6);
468			if (error)
469				goto out;
470		}
471		if (ia == NULL) {
472			error = EADDRNOTAVAIL;
473			goto out;
474		}
475		/* sanity for overflow - beware unsigned */
476		lt = &ifr->ifr_ifru.ifru_lifetime;
477		if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
478		    lt->ia6t_vltime + time_uptime < time_uptime) {
479			error = EINVAL;
480			goto out;
481		}
482		if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
483		    lt->ia6t_pltime + time_uptime < time_uptime) {
484			error = EINVAL;
485			goto out;
486		}
487		break;
488	    }
489	}
490
491	switch (cmd) {
492	case SIOCGIFADDR_IN6:
493		ifr->ifr_addr = ia->ia_addr;
494		if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
495			goto out;
496		break;
497
498	case SIOCGIFDSTADDR_IN6:
499		if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
500			error = EINVAL;
501			goto out;
502		}
503		/*
504		 * XXX: should we check if ifa_dstaddr is NULL and return
505		 * an error?
506		 */
507		ifr->ifr_dstaddr = ia->ia_dstaddr;
508		if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
509			goto out;
510		break;
511
512	case SIOCGIFNETMASK_IN6:
513		ifr->ifr_addr = ia->ia_prefixmask;
514		break;
515
516	case SIOCGIFAFLAG_IN6:
517		ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
518		break;
519
520	case SIOCGIFSTAT_IN6:
521		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
522		    ifp->if_afdata[AF_INET6])->in6_ifstat,
523		    &ifr->ifr_ifru.ifru_stat,
524		    sizeof(struct in6_ifstat) / sizeof(uint64_t));
525		break;
526
527	case SIOCGIFSTAT_ICMP6:
528		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
529		    ifp->if_afdata[AF_INET6])->icmp6_ifstat,
530		    &ifr->ifr_ifru.ifru_icmp6stat,
531		    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
532		break;
533
534	case SIOCGIFALIFETIME_IN6:
535		ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
536		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
537			time_t maxexpire;
538			struct in6_addrlifetime *retlt =
539			    &ifr->ifr_ifru.ifru_lifetime;
540
541			/*
542			 * XXX: adjust expiration time assuming time_t is
543			 * signed.
544			 */
545			maxexpire = (-1) &
546			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
547			if (ia->ia6_lifetime.ia6t_vltime <
548			    maxexpire - ia->ia6_updatetime) {
549				retlt->ia6t_expire = ia->ia6_updatetime +
550				    ia->ia6_lifetime.ia6t_vltime;
551			} else
552				retlt->ia6t_expire = maxexpire;
553		}
554		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
555			time_t maxexpire;
556			struct in6_addrlifetime *retlt =
557			    &ifr->ifr_ifru.ifru_lifetime;
558
559			/*
560			 * XXX: adjust expiration time assuming time_t is
561			 * signed.
562			 */
563			maxexpire = (-1) &
564			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
565			if (ia->ia6_lifetime.ia6t_pltime <
566			    maxexpire - ia->ia6_updatetime) {
567				retlt->ia6t_preferred = ia->ia6_updatetime +
568				    ia->ia6_lifetime.ia6t_pltime;
569			} else
570				retlt->ia6t_preferred = maxexpire;
571		}
572		break;
573
574	case SIOCSIFALIFETIME_IN6:
575		ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
576		/* for sanity */
577		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
578			ia->ia6_lifetime.ia6t_expire =
579				time_uptime + ia->ia6_lifetime.ia6t_vltime;
580		} else
581			ia->ia6_lifetime.ia6t_expire = 0;
582		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
583			ia->ia6_lifetime.ia6t_preferred =
584				time_uptime + ia->ia6_lifetime.ia6t_pltime;
585		} else
586			ia->ia6_lifetime.ia6t_preferred = 0;
587		break;
588
589	case SIOCAIFADDR_IN6:
590	{
591		struct nd_prefixctl pr0;
592		struct nd_prefix *pr;
593
594		/*
595		 * first, make or update the interface address structure,
596		 * and link it to the list.
597		 */
598		if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
599			goto out;
600		if (ia != NULL)
601			ifa_free(&ia->ia_ifa);
602		if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
603		    == NULL) {
604			/*
605			 * this can happen when the user specify the 0 valid
606			 * lifetime.
607			 */
608			break;
609		}
610
611		if (cmd == ocmd && ifra->ifra_vhid > 0) {
612			if (carp_attach_p != NULL)
613				error = (*carp_attach_p)(&ia->ia_ifa,
614				    ifra->ifra_vhid);
615			else
616				error = EPROTONOSUPPORT;
617			if (error)
618				goto out;
619			else
620				carp_attached = 1;
621		}
622
623		/*
624		 * then, make the prefix on-link on the interface.
625		 * XXX: we'd rather create the prefix before the address, but
626		 * we need at least one address to install the corresponding
627		 * interface route, so we configure the address first.
628		 */
629
630		/*
631		 * convert mask to prefix length (prefixmask has already
632		 * been validated in in6_update_ifa().
633		 */
634		bzero(&pr0, sizeof(pr0));
635		pr0.ndpr_ifp = ifp;
636		pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
637		    NULL);
638		if (pr0.ndpr_plen == 128) {
639			/* we don't need to install a host route. */
640			goto aifaddr_out;
641		}
642		pr0.ndpr_prefix = ifra->ifra_addr;
643		/* apply the mask for safety. */
644		IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
645		    &ifra->ifra_prefixmask.sin6_addr);
646
647		/*
648		 * XXX: since we don't have an API to set prefix (not address)
649		 * lifetimes, we just use the same lifetimes as addresses.
650		 * The (temporarily) installed lifetimes can be overridden by
651		 * later advertised RAs (when accept_rtadv is non 0), which is
652		 * an intended behavior.
653		 */
654		pr0.ndpr_raf_onlink = 1; /* should be configurable? */
655		pr0.ndpr_raf_auto =
656		    ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
657		pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
658		pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
659
660		/* add the prefix if not yet. */
661		if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
662			/*
663			 * nd6_prelist_add will install the corresponding
664			 * interface route.
665			 */
666			if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
667				if (carp_attached)
668					(*carp_detach_p)(&ia->ia_ifa);
669				goto out;
670			}
671			if (pr == NULL) {
672				if (carp_attached)
673					(*carp_detach_p)(&ia->ia_ifa);
674				log(LOG_ERR, "nd6_prelist_add succeeded but "
675				    "no prefix\n");
676				error = EINVAL;
677				goto out;
678			}
679		}
680
681		/* relate the address to the prefix */
682		if (ia->ia6_ndpr == NULL) {
683			ia->ia6_ndpr = pr;
684			pr->ndpr_refcnt++;
685
686			/*
687			 * If this is the first autoconf address from the
688			 * prefix, create a temporary address as well
689			 * (when required).
690			 */
691			if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
692			    V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
693				int e;
694				if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
695					log(LOG_NOTICE, "in6_control: failed "
696					    "to create a temporary address, "
697					    "errno=%d\n", e);
698				}
699			}
700		}
701
702		/*
703		 * this might affect the status of autoconfigured addresses,
704		 * that is, this address might make other addresses detached.
705		 */
706		pfxlist_onlink_check();
707aifaddr_out:
708		if (error != 0 || ia == NULL)
709			break;
710		/*
711		 * Try to clear the flag when a new IPv6 address is added
712		 * onto an IFDISABLED interface and it succeeds.
713		 */
714		if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
715			struct in6_ndireq nd;
716
717			memset(&nd, 0, sizeof(nd));
718			nd.ndi.flags = ND_IFINFO(ifp)->flags;
719			nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
720			if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
721				log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
722				    "SIOCSIFINFO_FLAGS for -ifdisabled "
723				    "failed.");
724			/*
725			 * Ignore failure of clearing the flag intentionally.
726			 * The failure means address duplication was detected.
727			 */
728		}
729		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
730		break;
731	}
732
733	case SIOCDIFADDR_IN6:
734	{
735		struct nd_prefix *pr;
736
737		/*
738		 * If the address being deleted is the only one that owns
739		 * the corresponding prefix, expire the prefix as well.
740		 * XXX: theoretically, we don't have to worry about such
741		 * relationship, since we separate the address management
742		 * and the prefix management.  We do this, however, to provide
743		 * as much backward compatibility as possible in terms of
744		 * the ioctl operation.
745		 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
746		 */
747		pr = ia->ia6_ndpr;
748		in6_purgeaddr(&ia->ia_ifa);
749		if (pr && pr->ndpr_refcnt == 0)
750			prelist_remove(pr);
751		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
752		break;
753	}
754
755	default:
756		if (ifp->if_ioctl == NULL) {
757			error = EOPNOTSUPP;
758			goto out;
759		}
760		error = (*ifp->if_ioctl)(ifp, cmd, data);
761		goto out;
762	}
763
764	error = 0;
765out:
766	if (ia != NULL)
767		ifa_free(&ia->ia_ifa);
768	return (error);
769}
770
771
772/*
773 * Join necessary multicast groups.  Factored out from in6_update_ifa().
774 * This entire work should only be done once, for the default FIB.
775 */
776static int
777in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
778    struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
779{
780	char ip6buf[INET6_ADDRSTRLEN];
781	struct in6_addr mltaddr;
782	struct in6_multi_mship *imm;
783	int delay, error;
784
785	KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
786
787	/* Join solicited multicast addr for new host id. */
788	bzero(&mltaddr, sizeof(struct in6_addr));
789	mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
790	mltaddr.s6_addr32[2] = htonl(1);
791	mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
792	mltaddr.s6_addr8[12] = 0xff;
793	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) {
794		/* XXX: should not happen */
795		log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
796		goto cleanup;
797	}
798	delay = error = 0;
799	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
800		/*
801		 * We need a random delay for DAD on the address being
802		 * configured.  It also means delaying transmission of the
803		 * corresponding MLD report to avoid report collision.
804		 * [RFC 4861, Section 6.3.7]
805		 */
806		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
807	}
808	imm = in6_joingroup(ifp, &mltaddr, &error, delay);
809	if (imm == NULL) {
810		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
811		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
812		    if_name(ifp), error));
813		goto cleanup;
814	}
815	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
816	*in6m_sol = imm->i6mm_maddr;
817
818	/*
819	 * Join link-local all-nodes address.
820	 */
821	mltaddr = in6addr_linklocal_allnodes;
822	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
823		goto cleanup; /* XXX: should not fail */
824
825	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
826	if (imm == NULL) {
827		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
828		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
829		    if_name(ifp), error));
830		goto cleanup;
831	}
832	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
833
834	/*
835	 * Join node information group address.
836	 */
837	delay = 0;
838	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
839		/*
840		 * The spec does not say anything about delay for this group,
841		 * but the same logic should apply.
842		 */
843		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
844	}
845	if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) {
846		/* XXX jinmei */
847		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
848		if (imm == NULL)
849			nd6log((LOG_WARNING,
850			    "%s: in6_joingroup failed for %s on %s "
851			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
852			    &mltaddr), if_name(ifp), error));
853			/* XXX not very fatal, go on... */
854		else
855			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
856	}
857	if (V_icmp6_nodeinfo_oldmcprefix &&
858	    in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) {
859		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
860		if (imm == NULL)
861			nd6log((LOG_WARNING,
862			    "%s: in6_joingroup failed for %s on %s "
863			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
864			    &mltaddr), if_name(ifp), error));
865			/* XXX not very fatal, go on... */
866		else
867			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
868	}
869
870	/*
871	 * Join interface-local all-nodes address.
872	 * (ff01::1%ifN, and ff01::%ifN/32)
873	 */
874	mltaddr = in6addr_nodelocal_allnodes;
875	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
876		goto cleanup; /* XXX: should not fail */
877
878	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
879	if (imm == NULL) {
880		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
881		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
882		    &mltaddr), if_name(ifp), error));
883		goto cleanup;
884	}
885	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
886
887cleanup:
888	return (error);
889}
890
891/*
892 * Update parameters of an IPv6 interface address.
893 * If necessary, a new entry is created and linked into address chains.
894 * This function is separated from in6_control().
895 */
896int
897in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
898    struct in6_ifaddr *ia, int flags)
899{
900	int error, hostIsNew = 0;
901
902	if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0)
903		return (error);
904
905	if (ia == NULL) {
906		hostIsNew = 1;
907		if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL)
908			return (ENOBUFS);
909	}
910
911	error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags);
912	if (error != 0) {
913		if (hostIsNew != 0) {
914			in6_unlink_ifa(ia, ifp);
915			ifa_free(&ia->ia_ifa);
916		}
917		return (error);
918	}
919
920	if (hostIsNew)
921		error = in6_broadcast_ifa(ifp, ifra, ia, flags);
922
923	return (error);
924}
925
926/*
927 * Fill in basic IPv6 address request info.
928 */
929void
930in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr,
931    const struct in6_addr *mask)
932{
933
934	memset(ifra, 0, sizeof(struct in6_aliasreq));
935
936	ifra->ifra_addr.sin6_family = AF_INET6;
937	ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
938	if (addr != NULL)
939		ifra->ifra_addr.sin6_addr = *addr;
940
941	ifra->ifra_prefixmask.sin6_family = AF_INET6;
942	ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
943	if (mask != NULL)
944		ifra->ifra_prefixmask.sin6_addr = *mask;
945}
946
947static int
948in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra,
949    struct in6_ifaddr *ia, int flags)
950{
951	int plen = -1;
952	struct sockaddr_in6 dst6;
953	struct in6_addrlifetime *lt;
954	char ip6buf[INET6_ADDRSTRLEN];
955
956	/* Validate parameters */
957	if (ifp == NULL || ifra == NULL) /* this maybe redundant */
958		return (EINVAL);
959
960	/*
961	 * The destination address for a p2p link must have a family
962	 * of AF_UNSPEC or AF_INET6.
963	 */
964	if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
965	    ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
966	    ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
967		return (EAFNOSUPPORT);
968
969	/*
970	 * Validate address
971	 */
972	if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) ||
973	    ifra->ifra_addr.sin6_family != AF_INET6)
974		return (EINVAL);
975
976	/*
977	 * validate ifra_prefixmask.  don't check sin6_family, netmask
978	 * does not carry fields other than sin6_len.
979	 */
980	if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
981		return (EINVAL);
982	/*
983	 * Because the IPv6 address architecture is classless, we require
984	 * users to specify a (non 0) prefix length (mask) for a new address.
985	 * We also require the prefix (when specified) mask is valid, and thus
986	 * reject a non-consecutive mask.
987	 */
988	if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
989		return (EINVAL);
990	if (ifra->ifra_prefixmask.sin6_len != 0) {
991		plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
992		    (u_char *)&ifra->ifra_prefixmask +
993		    ifra->ifra_prefixmask.sin6_len);
994		if (plen <= 0)
995			return (EINVAL);
996	} else {
997		/*
998		 * In this case, ia must not be NULL.  We just use its prefix
999		 * length.
1000		 */
1001		plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1002	}
1003	/*
1004	 * If the destination address on a p2p interface is specified,
1005	 * and the address is a scoped one, validate/set the scope
1006	 * zone identifier.
1007	 */
1008	dst6 = ifra->ifra_dstaddr;
1009	if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
1010	    (dst6.sin6_family == AF_INET6)) {
1011		struct in6_addr in6_tmp;
1012		u_int32_t zoneid;
1013
1014		in6_tmp = dst6.sin6_addr;
1015		if (in6_setscope(&in6_tmp, ifp, &zoneid))
1016			return (EINVAL); /* XXX: should be impossible */
1017
1018		if (dst6.sin6_scope_id != 0) {
1019			if (dst6.sin6_scope_id != zoneid)
1020				return (EINVAL);
1021		} else		/* user omit to specify the ID. */
1022			dst6.sin6_scope_id = zoneid;
1023
1024		/* convert into the internal form */
1025		if (sa6_embedscope(&dst6, 0))
1026			return (EINVAL); /* XXX: should be impossible */
1027	}
1028	/* Modify original ifra_dstaddr to reflect changes */
1029	ifra->ifra_dstaddr = dst6;
1030
1031	/*
1032	 * The destination address can be specified only for a p2p or a
1033	 * loopback interface.  If specified, the corresponding prefix length
1034	 * must be 128.
1035	 */
1036	if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
1037		if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
1038			/* XXX: noisy message */
1039			nd6log((LOG_INFO, "in6_update_ifa: a destination can "
1040			    "be specified for a p2p or a loopback IF only\n"));
1041			return (EINVAL);
1042		}
1043		if (plen != 128) {
1044			nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
1045			    "be 128 when dstaddr is specified\n"));
1046			return (EINVAL);
1047		}
1048	}
1049	/* lifetime consistency check */
1050	lt = &ifra->ifra_lifetime;
1051	if (lt->ia6t_pltime > lt->ia6t_vltime)
1052		return (EINVAL);
1053	if (lt->ia6t_vltime == 0) {
1054		/*
1055		 * the following log might be noisy, but this is a typical
1056		 * configuration mistake or a tool's bug.
1057		 */
1058		nd6log((LOG_INFO,
1059		    "in6_update_ifa: valid lifetime is 0 for %s\n",
1060		    ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1061
1062		if (ia == NULL)
1063			return (0); /* there's nothing to do */
1064	}
1065
1066	/* Check prefix mask */
1067	if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) {
1068		/*
1069		 * We prohibit changing the prefix length of an existing
1070		 * address, because
1071		 * + such an operation should be rare in IPv6, and
1072		 * + the operation would confuse prefix management.
1073		 */
1074		if (ia->ia_prefixmask.sin6_len != 0 &&
1075		    in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1076			nd6log((LOG_INFO, "in6_validate_ifa: the prefix length "
1077			    "of an existing %s address should not be changed\n",
1078			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1079
1080			return (EINVAL);
1081		}
1082	}
1083
1084	return (0);
1085}
1086
1087
1088/*
1089 * Allocate a new ifaddr and link it into chains.
1090 */
1091static struct in6_ifaddr *
1092in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
1093{
1094	struct in6_ifaddr *ia;
1095
1096	/*
1097	 * When in6_alloc_ifa() is called in a process of a received
1098	 * RA, it is called under an interrupt context.  So, we should
1099	 * call malloc with M_NOWAIT.
1100	 */
1101	ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT);
1102	if (ia == NULL)
1103		return (NULL);
1104	LIST_INIT(&ia->ia6_memberships);
1105	/* Initialize the address and masks, and put time stamp */
1106	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1107	ia->ia_addr.sin6_family = AF_INET6;
1108	ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1109	/* XXX: Can we assign ,sin6_addr and skip the rest? */
1110	ia->ia_addr = ifra->ifra_addr;
1111	ia->ia6_createtime = time_uptime;
1112	if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1113		/*
1114		 * Some functions expect that ifa_dstaddr is not
1115		 * NULL for p2p interfaces.
1116		 */
1117		ia->ia_ifa.ifa_dstaddr =
1118		    (struct sockaddr *)&ia->ia_dstaddr;
1119	} else {
1120		ia->ia_ifa.ifa_dstaddr = NULL;
1121	}
1122
1123	/* set prefix mask if any */
1124	ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1125	if (ifra->ifra_prefixmask.sin6_len != 0) {
1126		ia->ia_prefixmask.sin6_family = AF_INET6;
1127		ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len;
1128		ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr;
1129	}
1130
1131	ia->ia_ifp = ifp;
1132	ifa_ref(&ia->ia_ifa);			/* if_addrhead */
1133	IF_ADDR_WLOCK(ifp);
1134	TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1135	IF_ADDR_WUNLOCK(ifp);
1136
1137	ifa_ref(&ia->ia_ifa);			/* in6_ifaddrhead */
1138	IN6_IFADDR_WLOCK();
1139	TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1140	LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash);
1141	IN6_IFADDR_WUNLOCK();
1142
1143	return (ia);
1144}
1145
1146/*
1147 * Update/configure interface address parameters:
1148 *
1149 * 1) Update lifetime
1150 * 2) Update interface metric ad flags
1151 * 3) Notify other subsystems
1152 */
1153static int
1154in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
1155    struct in6_ifaddr *ia, int hostIsNew, int flags)
1156{
1157	int error;
1158
1159	/* update timestamp */
1160	ia->ia6_updatetime = time_uptime;
1161
1162	/*
1163	 * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
1164	 * to see if the address is deprecated or invalidated, but initialize
1165	 * these members for applications.
1166	 */
1167	ia->ia6_lifetime = ifra->ifra_lifetime;
1168	if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1169		ia->ia6_lifetime.ia6t_expire =
1170		    time_uptime + ia->ia6_lifetime.ia6t_vltime;
1171	} else
1172		ia->ia6_lifetime.ia6t_expire = 0;
1173	if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1174		ia->ia6_lifetime.ia6t_preferred =
1175		    time_uptime + ia->ia6_lifetime.ia6t_pltime;
1176	} else
1177		ia->ia6_lifetime.ia6t_preferred = 0;
1178
1179	/*
1180	 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1181	 * userland, make it deprecated.
1182	 */
1183	if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1184		ia->ia6_lifetime.ia6t_pltime = 0;
1185		ia->ia6_lifetime.ia6t_preferred = time_uptime;
1186	}
1187
1188	/*
1189	 * configure address flags.
1190	 */
1191	ia->ia6_flags = ifra->ifra_flags;
1192
1193	/*
1194	 * Make the address tentative before joining multicast addresses,
1195	 * so that corresponding MLD responses would not have a tentative
1196	 * source address.
1197	 */
1198	ia->ia6_flags &= ~IN6_IFF_DUPLICATED;	/* safety */
1199	if (hostIsNew && in6if_do_dad(ifp))
1200		ia->ia6_flags |= IN6_IFF_TENTATIVE;
1201
1202	/* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */
1203	if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1204		ia->ia6_flags |= IN6_IFF_TENTATIVE;
1205
1206	/* notify other subsystems */
1207	error = in6_notify_ifa(ifp, ia, ifra, hostIsNew);
1208
1209	return (error);
1210}
1211
1212/*
1213 * Do link-level ifa job:
1214 * 1) Add lle entry for added address
1215 * 2) Notifies routing socket users about new address
1216 * 3) join appropriate multicast group
1217 * 4) start DAD if enabled
1218 */
1219static int
1220in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1221    struct in6_ifaddr *ia, int flags)
1222{
1223	struct in6_multi *in6m_sol;
1224	int error = 0;
1225
1226	/* Add local address to lltable, if necessary (ex. on p2p link). */
1227	if ((error = nd6_add_ifa_lle(ia)) != 0) {
1228		in6_purgeaddr(&ia->ia_ifa);
1229		ifa_free(&ia->ia_ifa);
1230		return (error);
1231	}
1232
1233	/* Join necessary multicast groups. */
1234	in6m_sol = NULL;
1235	if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1236		error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1237		if (error != 0) {
1238			in6_purgeaddr(&ia->ia_ifa);
1239			ifa_free(&ia->ia_ifa);
1240			return (error);
1241		}
1242	}
1243
1244	/*
1245	 * Perform DAD, if needed.
1246	 * XXX It may be of use, if we can administratively disable DAD.
1247	 */
1248	if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
1249	    (ia->ia6_flags & IN6_IFF_TENTATIVE))
1250	{
1251		int delay, mindelay, maxdelay;
1252
1253		delay = 0;
1254		if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1255			/*
1256			 * We need to impose a delay before sending an NS
1257			 * for DAD.  Check if we also needed a delay for the
1258			 * corresponding MLD message.  If we did, the delay
1259			 * should be larger than the MLD delay (this could be
1260			 * relaxed a bit, but this simple logic is at least
1261			 * safe).
1262			 * XXX: Break data hiding guidelines and look at
1263			 * state for the solicited multicast group.
1264			 */
1265			mindelay = 0;
1266			if (in6m_sol != NULL &&
1267			    in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1268				mindelay = in6m_sol->in6m_timer;
1269			}
1270			maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1271			if (maxdelay - mindelay == 0)
1272				delay = 0;
1273			else {
1274				delay =
1275				    (arc4random() % (maxdelay - mindelay)) +
1276				    mindelay;
1277			}
1278		}
1279		nd6_dad_start((struct ifaddr *)ia, delay);
1280	}
1281
1282	ifa_free(&ia->ia_ifa);
1283	return (error);
1284}
1285
1286/*
1287 * Leave from multicast groups we have joined for the interface.
1288 */
1289static int
1290in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0)
1291{
1292	struct in6_multi_mship *imm;
1293
1294	while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1295		LIST_REMOVE(imm, i6mm_chain);
1296		in6_leavegroup(imm);
1297	}
1298	return (0);
1299}
1300
1301void
1302in6_purgeaddr(struct ifaddr *ifa)
1303{
1304	struct ifnet *ifp = ifa->ifa_ifp;
1305	struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1306	int plen, error;
1307	struct ifaddr *ifa0;
1308
1309	if (ifa->ifa_carp)
1310		(*carp_detach_p)(ifa);
1311
1312	/*
1313	 * find another IPv6 address as the gateway for the
1314	 * link-local and node-local all-nodes multicast
1315	 * address routes
1316	 */
1317	IF_ADDR_RLOCK(ifp);
1318	TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) {
1319		if ((ifa0->ifa_addr->sa_family != AF_INET6) ||
1320		    memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr,
1321		    &ia->ia_addr.sin6_addr, sizeof(struct in6_addr)) == 0)
1322			continue;
1323		else
1324			break;
1325	}
1326	if (ifa0 != NULL)
1327		ifa_ref(ifa0);
1328	IF_ADDR_RUNLOCK(ifp);
1329
1330	/*
1331	 * Remove the loopback route to the interface address.
1332	 * The check for the current setting of "nd6_useloopback"
1333	 * is not needed.
1334	 */
1335	if (ia->ia_flags & IFA_RTSELF) {
1336		error = ifa_del_loopback_route((struct ifaddr *)ia,
1337		    (struct sockaddr *)&ia->ia_addr);
1338		if (error == 0)
1339			ia->ia_flags &= ~IFA_RTSELF;
1340	}
1341
1342	/* stop DAD processing */
1343	nd6_dad_stop(ifa);
1344
1345	/* Remove local address entry from lltable. */
1346	nd6_rem_ifa_lle(ia);
1347
1348	/* Leave multicast groups. */
1349	error = in6_purgeaddr_mc(ifp, ia, ifa0);
1350
1351	if (ifa0 != NULL)
1352		ifa_free(ifa0);
1353
1354	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1355	if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1356		error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1357		    (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0);
1358		if (error != 0)
1359			log(LOG_INFO, "%s: err=%d, destination address delete "
1360			    "failed\n", __func__, error);
1361		ia->ia_flags &= ~IFA_ROUTE;
1362	}
1363
1364	in6_unlink_ifa(ia, ifp);
1365}
1366
1367static void
1368in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1369{
1370
1371	IF_ADDR_WLOCK(ifp);
1372	TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1373	IF_ADDR_WUNLOCK(ifp);
1374	ifa_free(&ia->ia_ifa);			/* if_addrhead */
1375
1376	/*
1377	 * Defer the release of what might be the last reference to the
1378	 * in6_ifaddr so that it can't be freed before the remainder of the
1379	 * cleanup.
1380	 */
1381	IN6_IFADDR_WLOCK();
1382	TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1383	LIST_REMOVE(ia, ia6_hash);
1384	IN6_IFADDR_WUNLOCK();
1385
1386	/*
1387	 * Release the reference to the base prefix.  There should be a
1388	 * positive reference.
1389	 */
1390	if (ia->ia6_ndpr == NULL) {
1391		nd6log((LOG_NOTICE,
1392		    "in6_unlink_ifa: autoconf'ed address "
1393		    "%p has no prefix\n", ia));
1394	} else {
1395		ia->ia6_ndpr->ndpr_refcnt--;
1396		ia->ia6_ndpr = NULL;
1397	}
1398
1399	/*
1400	 * Also, if the address being removed is autoconf'ed, call
1401	 * pfxlist_onlink_check() since the release might affect the status of
1402	 * other (detached) addresses.
1403	 */
1404	if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1405		pfxlist_onlink_check();
1406	}
1407	ifa_free(&ia->ia_ifa);			/* in6_ifaddrhead */
1408}
1409
1410/*
1411 * Notifies other other subsystems about address change/arrival:
1412 * 1) Notifies device handler on first IPv6 address assignment
1413 * 2) Handle routing table changes for P2P links and route
1414 * 3) Handle routing table changes for address host route
1415 */
1416static int
1417in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
1418    struct in6_aliasreq *ifra, int hostIsNew)
1419{
1420	int	error = 0, plen, ifacount = 0;
1421	struct ifaddr *ifa;
1422	struct sockaddr_in6 *pdst;
1423	char ip6buf[INET6_ADDRSTRLEN];
1424
1425	/*
1426	 * Give the interface a chance to initialize
1427	 * if this is its first address,
1428	 */
1429	if (hostIsNew != 0) {
1430		IF_ADDR_RLOCK(ifp);
1431		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1432			if (ifa->ifa_addr->sa_family != AF_INET6)
1433				continue;
1434			ifacount++;
1435		}
1436		IF_ADDR_RUNLOCK(ifp);
1437	}
1438
1439	if (ifacount <= 1 && ifp->if_ioctl) {
1440		error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1441		if (error)
1442			return (error);
1443	}
1444
1445	/*
1446	 * If a new destination address is specified, scrub the old one and
1447	 * install the new destination.  Note that the interface must be
1448	 * p2p or loopback.
1449	 */
1450	pdst = &ifra->ifra_dstaddr;
1451	if (pdst->sin6_family == AF_INET6 &&
1452	    !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1453		if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1454		    (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) {
1455			nd6log((LOG_ERR, "in6_update_ifa_internal: failed to "
1456			    "remove a route to the old destination: %s\n",
1457			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1458			/* proceed anyway... */
1459		} else
1460			ia->ia_flags &= ~IFA_ROUTE;
1461		ia->ia_dstaddr = *pdst;
1462	}
1463
1464	/*
1465	 * If a new destination address is specified for a point-to-point
1466	 * interface, install a route to the destination as an interface
1467	 * direct route.
1468	 * XXX: the logic below rejects assigning multiple addresses on a p2p
1469	 * interface that share the same destination.
1470	 */
1471	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1472	if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1473	    ia->ia_dstaddr.sin6_family == AF_INET6) {
1474		int rtflags = RTF_UP | RTF_HOST;
1475		/*
1476		 * Handle the case for ::1 .
1477		 */
1478		if (ifp->if_flags & IFF_LOOPBACK)
1479			ia->ia_flags |= IFA_RTSELF;
1480		error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1481		if (error)
1482			return (error);
1483		ia->ia_flags |= IFA_ROUTE;
1484	}
1485
1486	/*
1487	 * add a loopback route to self if not exists
1488	 */
1489	if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1490		error = ifa_add_loopback_route((struct ifaddr *)ia,
1491		    (struct sockaddr *)&ia->ia_addr);
1492		if (error == 0)
1493			ia->ia_flags |= IFA_RTSELF;
1494	}
1495
1496	return (error);
1497}
1498
1499/*
1500 * Find an IPv6 interface link-local address specific to an interface.
1501 * ifaddr is returned referenced.
1502 */
1503struct in6_ifaddr *
1504in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1505{
1506	struct ifaddr *ifa;
1507
1508	IF_ADDR_RLOCK(ifp);
1509	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1510		if (ifa->ifa_addr->sa_family != AF_INET6)
1511			continue;
1512		if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1513			if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1514			    ignoreflags) != 0)
1515				continue;
1516			ifa_ref(ifa);
1517			break;
1518		}
1519	}
1520	IF_ADDR_RUNLOCK(ifp);
1521
1522	return ((struct in6_ifaddr *)ifa);
1523}
1524
1525
1526/*
1527 * find the internet address corresponding to a given address.
1528 * ifaddr is returned referenced.
1529 */
1530struct in6_ifaddr *
1531in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid)
1532{
1533	struct in6_ifaddr *ia;
1534
1535	IN6_IFADDR_RLOCK();
1536	LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) {
1537		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) {
1538			if (zoneid != 0 &&
1539			    zoneid != ia->ia_addr.sin6_scope_id)
1540				continue;
1541			ifa_ref(&ia->ia_ifa);
1542			break;
1543		}
1544	}
1545	IN6_IFADDR_RUNLOCK();
1546	return (ia);
1547}
1548
1549/*
1550 * find the internet address corresponding to a given interface and address.
1551 * ifaddr is returned referenced.
1552 */
1553struct in6_ifaddr *
1554in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
1555{
1556	struct ifaddr *ifa;
1557
1558	IF_ADDR_RLOCK(ifp);
1559	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1560		if (ifa->ifa_addr->sa_family != AF_INET6)
1561			continue;
1562		if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1563			ifa_ref(ifa);
1564			break;
1565		}
1566	}
1567	IF_ADDR_RUNLOCK(ifp);
1568
1569	return ((struct in6_ifaddr *)ifa);
1570}
1571
1572/*
1573 * Find a link-local scoped address on ifp and return it if any.
1574 */
1575struct in6_ifaddr *
1576in6ifa_llaonifp(struct ifnet *ifp)
1577{
1578	struct sockaddr_in6 *sin6;
1579	struct ifaddr *ifa;
1580
1581	if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1582		return (NULL);
1583	if_addr_rlock(ifp);
1584	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1585		if (ifa->ifa_addr->sa_family != AF_INET6)
1586			continue;
1587		sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1588		if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
1589		    IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
1590		    IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
1591			break;
1592	}
1593	if_addr_runlock(ifp);
1594
1595	return ((struct in6_ifaddr *)ifa);
1596}
1597
1598/*
1599 * Convert IP6 address to printable (loggable) representation. Caller
1600 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
1601 */
1602static char digits[] = "0123456789abcdef";
1603char *
1604ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
1605{
1606	int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
1607	char *cp;
1608	const u_int16_t *a = (const u_int16_t *)addr;
1609	const u_int8_t *d;
1610	int dcolon = 0, zero = 0;
1611
1612	cp = ip6buf;
1613
1614	for (i = 0; i < 8; i++) {
1615		if (*(a + i) == 0) {
1616			cnt++;
1617			if (cnt == 1)
1618				idx = i;
1619		}
1620		else if (maxcnt < cnt) {
1621			maxcnt = cnt;
1622			index = idx;
1623			cnt = 0;
1624		}
1625	}
1626	if (maxcnt < cnt) {
1627		maxcnt = cnt;
1628		index = idx;
1629	}
1630
1631	for (i = 0; i < 8; i++) {
1632		if (dcolon == 1) {
1633			if (*a == 0) {
1634				if (i == 7)
1635					*cp++ = ':';
1636				a++;
1637				continue;
1638			} else
1639				dcolon = 2;
1640		}
1641		if (*a == 0) {
1642			if (dcolon == 0 && *(a + 1) == 0 && i == index) {
1643				if (i == 0)
1644					*cp++ = ':';
1645				*cp++ = ':';
1646				dcolon = 1;
1647			} else {
1648				*cp++ = '0';
1649				*cp++ = ':';
1650			}
1651			a++;
1652			continue;
1653		}
1654		d = (const u_char *)a;
1655		/* Try to eliminate leading zeros in printout like in :0001. */
1656		zero = 1;
1657		*cp = digits[*d >> 4];
1658		if (*cp != '0') {
1659			zero = 0;
1660			cp++;
1661		}
1662		*cp = digits[*d++ & 0xf];
1663		if (zero == 0 || (*cp != '0')) {
1664			zero = 0;
1665			cp++;
1666		}
1667		*cp = digits[*d >> 4];
1668		if (zero == 0 || (*cp != '0')) {
1669			zero = 0;
1670			cp++;
1671		}
1672		*cp++ = digits[*d & 0xf];
1673		*cp++ = ':';
1674		a++;
1675	}
1676	*--cp = '\0';
1677	return (ip6buf);
1678}
1679
1680int
1681in6_localaddr(struct in6_addr *in6)
1682{
1683	struct in6_ifaddr *ia;
1684
1685	if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1686		return 1;
1687
1688	IN6_IFADDR_RLOCK();
1689	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1690		if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1691		    &ia->ia_prefixmask.sin6_addr)) {
1692			IN6_IFADDR_RUNLOCK();
1693			return 1;
1694		}
1695	}
1696	IN6_IFADDR_RUNLOCK();
1697
1698	return (0);
1699}
1700
1701/*
1702 * Return 1 if an internet address is for the local host and configured
1703 * on one of its interfaces.
1704 */
1705int
1706in6_localip(struct in6_addr *in6)
1707{
1708	struct in6_ifaddr *ia;
1709
1710	IN6_IFADDR_RLOCK();
1711	LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
1712		if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
1713			IN6_IFADDR_RUNLOCK();
1714			return (1);
1715		}
1716	}
1717	IN6_IFADDR_RUNLOCK();
1718	return (0);
1719}
1720
1721int
1722in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
1723{
1724	struct in6_ifaddr *ia;
1725
1726	IN6_IFADDR_RLOCK();
1727	LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
1728		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
1729			if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
1730				IN6_IFADDR_RUNLOCK();
1731				return (1); /* true */
1732			}
1733			break;
1734		}
1735	}
1736	IN6_IFADDR_RUNLOCK();
1737
1738	return (0);		/* false */
1739}
1740
1741/*
1742 * return length of part which dst and src are equal
1743 * hard coding...
1744 */
1745int
1746in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
1747{
1748	int match = 0;
1749	u_char *s = (u_char *)src, *d = (u_char *)dst;
1750	u_char *lim = s + 16, r;
1751
1752	while (s < lim)
1753		if ((r = (*d++ ^ *s++)) != 0) {
1754			while (r < 128) {
1755				match++;
1756				r <<= 1;
1757			}
1758			break;
1759		} else
1760			match += 8;
1761	return match;
1762}
1763
1764/* XXX: to be scope conscious */
1765int
1766in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
1767{
1768	int bytelen, bitlen;
1769
1770	/* sanity check */
1771	if (0 > len || len > 128) {
1772		log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1773		    len);
1774		return (0);
1775	}
1776
1777	bytelen = len / 8;
1778	bitlen = len % 8;
1779
1780	if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
1781		return (0);
1782	if (bitlen != 0 &&
1783	    p1->s6_addr[bytelen] >> (8 - bitlen) !=
1784	    p2->s6_addr[bytelen] >> (8 - bitlen))
1785		return (0);
1786
1787	return (1);
1788}
1789
1790void
1791in6_prefixlen2mask(struct in6_addr *maskp, int len)
1792{
1793	u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
1794	int bytelen, bitlen, i;
1795
1796	/* sanity check */
1797	if (0 > len || len > 128) {
1798		log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
1799		    len);
1800		return;
1801	}
1802
1803	bzero(maskp, sizeof(*maskp));
1804	bytelen = len / 8;
1805	bitlen = len % 8;
1806	for (i = 0; i < bytelen; i++)
1807		maskp->s6_addr[i] = 0xff;
1808	if (bitlen)
1809		maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
1810}
1811
1812/*
1813 * return the best address out of the same scope. if no address was
1814 * found, return the first valid address from designated IF.
1815 */
1816struct in6_ifaddr *
1817in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
1818{
1819	int dst_scope =	in6_addrscope(dst), blen = -1, tlen;
1820	struct ifaddr *ifa;
1821	struct in6_ifaddr *besta = 0;
1822	struct in6_ifaddr *dep[2];	/* last-resort: deprecated */
1823
1824	dep[0] = dep[1] = NULL;
1825
1826	/*
1827	 * We first look for addresses in the same scope.
1828	 * If there is one, return it.
1829	 * If two or more, return one which matches the dst longest.
1830	 * If none, return one of global addresses assigned other ifs.
1831	 */
1832	IF_ADDR_RLOCK(ifp);
1833	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1834		if (ifa->ifa_addr->sa_family != AF_INET6)
1835			continue;
1836		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1837			continue; /* XXX: is there any case to allow anycast? */
1838		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1839			continue; /* don't use this interface */
1840		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1841			continue;
1842		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1843			if (V_ip6_use_deprecated)
1844				dep[0] = (struct in6_ifaddr *)ifa;
1845			continue;
1846		}
1847
1848		if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
1849			/*
1850			 * call in6_matchlen() as few as possible
1851			 */
1852			if (besta) {
1853				if (blen == -1)
1854					blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
1855				tlen = in6_matchlen(IFA_IN6(ifa), dst);
1856				if (tlen > blen) {
1857					blen = tlen;
1858					besta = (struct in6_ifaddr *)ifa;
1859				}
1860			} else
1861				besta = (struct in6_ifaddr *)ifa;
1862		}
1863	}
1864	if (besta) {
1865		ifa_ref(&besta->ia_ifa);
1866		IF_ADDR_RUNLOCK(ifp);
1867		return (besta);
1868	}
1869
1870	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1871		if (ifa->ifa_addr->sa_family != AF_INET6)
1872			continue;
1873		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1874			continue; /* XXX: is there any case to allow anycast? */
1875		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1876			continue; /* don't use this interface */
1877		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1878			continue;
1879		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1880			if (V_ip6_use_deprecated)
1881				dep[1] = (struct in6_ifaddr *)ifa;
1882			continue;
1883		}
1884
1885		if (ifa != NULL)
1886			ifa_ref(ifa);
1887		IF_ADDR_RUNLOCK(ifp);
1888		return (struct in6_ifaddr *)ifa;
1889	}
1890
1891	/* use the last-resort values, that are, deprecated addresses */
1892	if (dep[0]) {
1893		ifa_ref((struct ifaddr *)dep[0]);
1894		IF_ADDR_RUNLOCK(ifp);
1895		return dep[0];
1896	}
1897	if (dep[1]) {
1898		ifa_ref((struct ifaddr *)dep[1]);
1899		IF_ADDR_RUNLOCK(ifp);
1900		return dep[1];
1901	}
1902
1903	IF_ADDR_RUNLOCK(ifp);
1904	return NULL;
1905}
1906
1907/*
1908 * perform DAD when interface becomes IFF_UP.
1909 */
1910void
1911in6_if_up(struct ifnet *ifp)
1912{
1913	struct ifaddr *ifa;
1914	struct in6_ifaddr *ia;
1915
1916	IF_ADDR_RLOCK(ifp);
1917	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1918		if (ifa->ifa_addr->sa_family != AF_INET6)
1919			continue;
1920		ia = (struct in6_ifaddr *)ifa;
1921		if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
1922			/*
1923			 * The TENTATIVE flag was likely set by hand
1924			 * beforehand, implicitly indicating the need for DAD.
1925			 * We may be able to skip the random delay in this
1926			 * case, but we impose delays just in case.
1927			 */
1928			nd6_dad_start(ifa,
1929			    arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
1930		}
1931	}
1932	IF_ADDR_RUNLOCK(ifp);
1933
1934	/*
1935	 * special cases, like 6to4, are handled in in6_ifattach
1936	 */
1937	in6_ifattach(ifp, NULL);
1938}
1939
1940int
1941in6if_do_dad(struct ifnet *ifp)
1942{
1943	if ((ifp->if_flags & IFF_LOOPBACK) != 0)
1944		return (0);
1945
1946	if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1947		return (0);
1948
1949	/*
1950	 * Our DAD routine requires the interface up and running.
1951	 * However, some interfaces can be up before the RUNNING
1952	 * status.  Additionaly, users may try to assign addresses
1953	 * before the interface becomes up (or running).
1954	 * We simply skip DAD in such a case as a work around.
1955	 * XXX: we should rather mark "tentative" on such addresses,
1956	 * and do DAD after the interface becomes ready.
1957	 */
1958	if (!((ifp->if_flags & IFF_UP) &&
1959	    (ifp->if_drv_flags & IFF_DRV_RUNNING)))
1960		return (0);
1961
1962	return (1);
1963}
1964
1965/*
1966 * Calculate max IPv6 MTU through all the interfaces and store it
1967 * to in6_maxmtu.
1968 */
1969void
1970in6_setmaxmtu(void)
1971{
1972	unsigned long maxmtu = 0;
1973	struct ifnet *ifp;
1974
1975	IFNET_RLOCK_NOSLEEP();
1976	TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1977		/* this function can be called during ifnet initialization */
1978		if (!ifp->if_afdata[AF_INET6])
1979			continue;
1980		if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
1981		    IN6_LINKMTU(ifp) > maxmtu)
1982			maxmtu = IN6_LINKMTU(ifp);
1983	}
1984	IFNET_RUNLOCK_NOSLEEP();
1985	if (maxmtu)	/* update only when maxmtu is positive */
1986		V_in6_maxmtu = maxmtu;
1987}
1988
1989/*
1990 * Provide the length of interface identifiers to be used for the link attached
1991 * to the given interface.  The length should be defined in "IPv6 over
1992 * xxx-link" document.  Note that address architecture might also define
1993 * the length for a particular set of address prefixes, regardless of the
1994 * link type.  As clarified in rfc2462bis, those two definitions should be
1995 * consistent, and those really are as of August 2004.
1996 */
1997int
1998in6_if2idlen(struct ifnet *ifp)
1999{
2000	switch (ifp->if_type) {
2001	case IFT_ETHER:		/* RFC2464 */
2002#ifdef IFT_PROPVIRTUAL
2003	case IFT_PROPVIRTUAL:	/* XXX: no RFC. treat it as ether */
2004#endif
2005#ifdef IFT_L2VLAN
2006	case IFT_L2VLAN:	/* ditto */
2007#endif
2008#ifdef IFT_IEEE80211
2009	case IFT_IEEE80211:	/* ditto */
2010#endif
2011#ifdef IFT_MIP
2012	case IFT_MIP:	/* ditto */
2013#endif
2014	case IFT_INFINIBAND:
2015		return (64);
2016	case IFT_FDDI:		/* RFC2467 */
2017		return (64);
2018	case IFT_ISO88025:	/* RFC2470 (IPv6 over Token Ring) */
2019		return (64);
2020	case IFT_PPP:		/* RFC2472 */
2021		return (64);
2022	case IFT_ARCNET:	/* RFC2497 */
2023		return (64);
2024	case IFT_FRELAY:	/* RFC2590 */
2025		return (64);
2026	case IFT_IEEE1394:	/* RFC3146 */
2027		return (64);
2028	case IFT_GIF:
2029		return (64);	/* draft-ietf-v6ops-mech-v2-07 */
2030	case IFT_LOOP:
2031		return (64);	/* XXX: is this really correct? */
2032	default:
2033		/*
2034		 * Unknown link type:
2035		 * It might be controversial to use the today's common constant
2036		 * of 64 for these cases unconditionally.  For full compliance,
2037		 * we should return an error in this case.  On the other hand,
2038		 * if we simply miss the standard for the link type or a new
2039		 * standard is defined for a new link type, the IFID length
2040		 * is very likely to be the common constant.  As a compromise,
2041		 * we always use the constant, but make an explicit notice
2042		 * indicating the "unknown" case.
2043		 */
2044		printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2045		return (64);
2046	}
2047}
2048
2049#include <sys/sysctl.h>
2050
2051struct in6_llentry {
2052	struct llentry		base;
2053	struct sockaddr_in6	l3_addr6;
2054};
2055
2056/*
2057 * Deletes an address from the address table.
2058 * This function is called by the timer functions
2059 * such as arptimer() and nd6_llinfo_timer(), and
2060 * the caller does the locking.
2061 */
2062static void
2063in6_lltable_free(struct lltable *llt, struct llentry *lle)
2064{
2065	LLE_WUNLOCK(lle);
2066	LLE_LOCK_DESTROY(lle);
2067	free(lle, M_LLTABLE);
2068}
2069
2070static struct llentry *
2071in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
2072{
2073	struct in6_llentry *lle;
2074
2075	lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2076	if (lle == NULL)		/* NB: caller generates msg */
2077		return NULL;
2078
2079	lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
2080	lle->base.lle_refcnt = 1;
2081	lle->base.lle_free = in6_lltable_free;
2082	LLE_LOCK_INIT(&lle->base);
2083	callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock,
2084	    CALLOUT_RETURNUNLOCKED);
2085
2086	return (&lle->base);
2087}
2088
2089static void
2090in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix,
2091    const struct sockaddr *mask, u_int flags)
2092{
2093	const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
2094	const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
2095	struct llentry *lle, *next;
2096	int i;
2097
2098	/*
2099	 * (flags & LLE_STATIC) means deleting all entries
2100	 * including static ND6 entries.
2101	 */
2102	IF_AFDATA_WLOCK(llt->llt_ifp);
2103	for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2104		LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
2105			if (IN6_ARE_MASKED_ADDR_EQUAL(
2106			    &satosin6(L3_ADDR(lle))->sin6_addr,
2107			    &pfx->sin6_addr, &msk->sin6_addr) &&
2108			    ((flags & LLE_STATIC) ||
2109			    !(lle->la_flags & LLE_STATIC))) {
2110				LLE_WLOCK(lle);
2111				if (callout_stop(&lle->la_timer))
2112					LLE_REMREF(lle);
2113				llentry_free(lle);
2114			}
2115		}
2116	}
2117	IF_AFDATA_WUNLOCK(llt->llt_ifp);
2118}
2119
2120static int
2121in6_lltable_rtcheck(struct ifnet *ifp,
2122		    u_int flags,
2123		    const struct sockaddr *l3addr)
2124{
2125	struct rtentry *rt;
2126	char ip6buf[INET6_ADDRSTRLEN];
2127
2128	KASSERT(l3addr->sa_family == AF_INET6,
2129	    ("sin_family %d", l3addr->sa_family));
2130
2131	/* Our local addresses are always only installed on the default FIB. */
2132	/* XXX rtalloc1 should take a const param */
2133	rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0,
2134	    RT_DEFAULT_FIB);
2135	if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
2136		struct ifaddr *ifa;
2137		/*
2138		 * Create an ND6 cache for an IPv6 neighbor
2139		 * that is not covered by our own prefix.
2140		 */
2141		/* XXX ifaof_ifpforaddr should take a const param */
2142		ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp);
2143		if (ifa != NULL) {
2144			ifa_free(ifa);
2145			if (rt != NULL)
2146				RTFREE_LOCKED(rt);
2147			return 0;
2148		}
2149		log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2150		    ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
2151		if (rt != NULL)
2152			RTFREE_LOCKED(rt);
2153		return EINVAL;
2154	}
2155	RTFREE_LOCKED(rt);
2156	return 0;
2157}
2158
2159static struct llentry *
2160in6_lltable_lookup(struct lltable *llt, u_int flags,
2161	const struct sockaddr *l3addr)
2162{
2163	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2164	struct ifnet *ifp = llt->llt_ifp;
2165	struct llentry *lle;
2166	struct llentries *lleh;
2167	u_int hashkey;
2168
2169	IF_AFDATA_LOCK_ASSERT(ifp);
2170	KASSERT(l3addr->sa_family == AF_INET6,
2171	    ("sin_family %d", l3addr->sa_family));
2172
2173	hashkey = sin6->sin6_addr.s6_addr32[3];
2174	lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
2175	LIST_FOREACH(lle, lleh, lle_next) {
2176		struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle);
2177		if (lle->la_flags & LLE_DELETED)
2178			continue;
2179		if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr,
2180		    sizeof(struct in6_addr)) == 0)
2181			break;
2182	}
2183
2184	if (lle == NULL) {
2185		if (!(flags & LLE_CREATE))
2186			return (NULL);
2187		IF_AFDATA_WLOCK_ASSERT(ifp);
2188		/*
2189		 * A route that covers the given address must have
2190		 * been installed 1st because we are doing a resolution,
2191		 * verify this.
2192		 */
2193		if (!(flags & LLE_IFADDR) &&
2194		    in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2195			return NULL;
2196
2197		lle = in6_lltable_new(l3addr, flags);
2198		if (lle == NULL) {
2199			log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2200			return NULL;
2201		}
2202		lle->la_flags = flags & ~LLE_CREATE;
2203		if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
2204			bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
2205			lle->la_flags |= (LLE_VALID | LLE_STATIC);
2206		}
2207
2208		lle->lle_tbl  = llt;
2209		lle->lle_head = lleh;
2210		lle->la_flags |= LLE_LINKED;
2211		LIST_INSERT_HEAD(lleh, lle, lle_next);
2212	} else if (flags & LLE_DELETE) {
2213		if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
2214			LLE_WLOCK(lle);
2215			lle->la_flags |= LLE_DELETED;
2216#ifdef DIAGNOSTIC
2217			log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2218#endif
2219			if ((lle->la_flags &
2220			    (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC)
2221				llentry_free(lle);
2222			else
2223				LLE_WUNLOCK(lle);
2224		}
2225		lle = (void *)-1;
2226	}
2227	if (LLE_IS_VALID(lle)) {
2228		if (flags & LLE_EXCLUSIVE)
2229			LLE_WLOCK(lle);
2230		else
2231			LLE_RLOCK(lle);
2232	}
2233	return (lle);
2234}
2235
2236static int
2237in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
2238{
2239	struct ifnet *ifp = llt->llt_ifp;
2240	struct llentry *lle;
2241	/* XXX stack use */
2242	struct {
2243		struct rt_msghdr	rtm;
2244		struct sockaddr_in6	sin6;
2245		/*
2246		 * ndp.c assumes that sdl is word aligned
2247		 */
2248#ifdef __LP64__
2249		uint32_t		pad;
2250#endif
2251		struct sockaddr_dl	sdl;
2252	} ndpc;
2253	int i, error;
2254
2255	if (ifp->if_flags & IFF_LOOPBACK)
2256		return 0;
2257
2258	LLTABLE_LOCK_ASSERT();
2259
2260	error = 0;
2261	for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2262		LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
2263			struct sockaddr_dl *sdl;
2264
2265			/* skip deleted or invalid entries */
2266			if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
2267				continue;
2268			/* Skip if jailed and not a valid IP of the prison. */
2269			if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
2270				continue;
2271			/*
2272			 * produce a msg made of:
2273			 *  struct rt_msghdr;
2274			 *  struct sockaddr_in6 (IPv6)
2275			 *  struct sockaddr_dl;
2276			 */
2277			bzero(&ndpc, sizeof(ndpc));
2278			ndpc.rtm.rtm_msglen = sizeof(ndpc);
2279			ndpc.rtm.rtm_version = RTM_VERSION;
2280			ndpc.rtm.rtm_type = RTM_GET;
2281			ndpc.rtm.rtm_flags = RTF_UP;
2282			ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2283			ndpc.sin6.sin6_family = AF_INET6;
2284			ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
2285			bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
2286			if (V_deembed_scopeid)
2287				sa6_recoverscope(&ndpc.sin6);
2288
2289			/* publish */
2290			if (lle->la_flags & LLE_PUB)
2291				ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2292
2293			sdl = &ndpc.sdl;
2294			sdl->sdl_family = AF_LINK;
2295			sdl->sdl_len = sizeof(*sdl);
2296			sdl->sdl_alen = ifp->if_addrlen;
2297			sdl->sdl_index = ifp->if_index;
2298			sdl->sdl_type = ifp->if_type;
2299			bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
2300			ndpc.rtm.rtm_rmx.rmx_expire =
2301			    lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
2302			ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2303			if (lle->la_flags & LLE_STATIC)
2304				ndpc.rtm.rtm_flags |= RTF_STATIC;
2305			ndpc.rtm.rtm_index = ifp->if_index;
2306			error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2307			if (error)
2308				break;
2309		}
2310	}
2311	return error;
2312}
2313
2314void *
2315in6_domifattach(struct ifnet *ifp)
2316{
2317	struct in6_ifextra *ext;
2318
2319	/* There are not IPv6-capable interfaces. */
2320	switch (ifp->if_type) {
2321	case IFT_PFLOG:
2322	case IFT_PFSYNC:
2323	case IFT_USB:
2324		return (NULL);
2325	}
2326	ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2327	bzero(ext, sizeof(*ext));
2328
2329	ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
2330	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
2331	COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
2332	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
2333
2334	ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
2335	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
2336	    M_WAITOK);
2337	COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
2338	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
2339
2340	ext->nd_ifinfo = nd6_ifattach(ifp);
2341	ext->scope6_id = scope6_ifattach(ifp);
2342	ext->lltable = lltable_init(ifp, AF_INET6);
2343	if (ext->lltable != NULL) {
2344		ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
2345		ext->lltable->llt_lookup = in6_lltable_lookup;
2346		ext->lltable->llt_dump = in6_lltable_dump;
2347	}
2348
2349	ext->mld_ifinfo = mld_domifattach(ifp);
2350
2351	return ext;
2352}
2353
2354int
2355in6_domifmtu(struct ifnet *ifp)
2356{
2357
2358	return (IN6_LINKMTU(ifp));
2359}
2360
2361void
2362in6_domifdetach(struct ifnet *ifp, void *aux)
2363{
2364	struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2365
2366	mld_domifdetach(ifp);
2367	scope6_ifdetach(ext->scope6_id);
2368	nd6_ifdetach(ext->nd_ifinfo);
2369	lltable_free(ext->lltable);
2370	COUNTER_ARRAY_FREE(ext->in6_ifstat,
2371	    sizeof(struct in6_ifstat) / sizeof(uint64_t));
2372	free(ext->in6_ifstat, M_IFADDR);
2373	COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
2374	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
2375	free(ext->icmp6_ifstat, M_IFADDR);
2376	free(ext, M_IFADDR);
2377}
2378
2379/*
2380 * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
2381 * v4 mapped addr or v4 compat addr
2382 */
2383void
2384in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2385{
2386
2387	bzero(sin, sizeof(*sin));
2388	sin->sin_len = sizeof(struct sockaddr_in);
2389	sin->sin_family = AF_INET;
2390	sin->sin_port = sin6->sin6_port;
2391	sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2392}
2393
2394/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2395void
2396in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2397{
2398	bzero(sin6, sizeof(*sin6));
2399	sin6->sin6_len = sizeof(struct sockaddr_in6);
2400	sin6->sin6_family = AF_INET6;
2401	sin6->sin6_port = sin->sin_port;
2402	sin6->sin6_addr.s6_addr32[0] = 0;
2403	sin6->sin6_addr.s6_addr32[1] = 0;
2404	sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2405	sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2406}
2407
2408/* Convert sockaddr_in6 into sockaddr_in. */
2409void
2410in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2411{
2412	struct sockaddr_in *sin_p;
2413	struct sockaddr_in6 sin6;
2414
2415	/*
2416	 * Save original sockaddr_in6 addr and convert it
2417	 * to sockaddr_in.
2418	 */
2419	sin6 = *(struct sockaddr_in6 *)nam;
2420	sin_p = (struct sockaddr_in *)nam;
2421	in6_sin6_2_sin(sin_p, &sin6);
2422}
2423
2424/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2425void
2426in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2427{
2428	struct sockaddr_in *sin_p;
2429	struct sockaddr_in6 *sin6_p;
2430
2431	sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2432	sin_p = (struct sockaddr_in *)*nam;
2433	in6_sin_2_v4mapsin6(sin_p, sin6_p);
2434	free(*nam, M_SONAME);
2435	*nam = (struct sockaddr *)sin6_p;
2436}
2437